In the present invention, there is disclosed a method for separating in a mobile dewatering unit sludge and water in sewage wells, comprising means for sucking water and sludge, separating sludge and water, and returning purified and oxygenated water with substantially maintained micro flora to the well, wherein the method is characterized by the following steps: gradual suction of the water in the well and sludge under the addition of oxygen; mechanical separation of sludge particles to a certain, predetermined, smallest size; and continuous adding of the mechanically purified water in the sludge containing water being sucked gradually from the well under the addition of oxygen. The purified water under pressure being used to lift the sludge containing water wherein the previous steps being repeated until the initial amount of water in the well is been substantially taken up into the dewatering unit for mechanical separation of sludge particles, and the well is refilled under the addition of oxygen, with the mechanically purified water containing particles of up to a certain, predetermined largest size. Disclosed is also a mobile unit for making the above-described method wherein the mobile unit comprises a nozzle (1) of ejector type for sucking well water and sludge under the addition of oxygen; at least one screening cylinder (8) for mechanical separation of sludge particles to a smallest size of approximately 0.8 to 2.0 mm; means such as tanks, pumps, valves and pipes for collecting and using the screened water for continuous driving of the ejector nozzle (1), and for refilling the well with the screened water containing a rest of sludge particles and under the addition of oxygen through the ejector-type nozzle (1).
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